2. the time when the subject experienced the presence of at least one symptom, whichever occurs first 11. Female subjects must be post-menopausal (one year or greater without menses), surgically incapable of childbearing, or practicing two effective methods of birth control. Acceptable methods may include intrauterine device, spermicide, barrier and hormonal contraception. A female subject must agree to practice an acceptable method of birth control during the study period. All female subjects regardless of menopausal status or surgical history must have had a negative urine pregnancy test during the screening visit and prior to dosing.